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Long-Term Debt - Revolving Credit and Convertible Notes (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Oct. 03, 2017
USD ($)
Nov. 19, 2013
USD ($)
shares
Mar. 31, 2018
USD ($)
item
$ / shares
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jul. 28, 2014
USD ($)
Long-Term Debt            
Repayment of outstanding borrowings     $ 150,518 $ 133,399    
Revolving Credit Facility            
Long-Term Debt            
Maximum borrowing capacity     400,000      
Sublimit for swingline loans $ 50,000          
Sublimit for letters of credit $ 30,000          
Amount outstanding     $ 117,200      
Weighted average interest rate, as a percent     3.40%   3.20%  
Accordion Provision Under Credit Facility [Member]            
Long-Term Debt            
Maximum borrowing capacity     $ 500,000      
Letter of Credit [Member]            
Long-Term Debt            
Amount outstanding     3,800      
Senior Notes 5.125 Percent Due 2022            
Long-Term Debt            
Face amount of debt issuance     $ 250,000     $ 250,000
Interest rate, as a percentage     5.125%   5.125%  
Restricted assets     $ 0      
Convertible Senior Notes 1.00 percent due 2020            
Long-Term Debt            
Face amount of debt issuance   $ 287,500 $ 287,500      
Interest rate, as a percentage     1.00%   1.00%  
Net proceeds after fees and shares repurchase   $ 254,200        
Shares repurchased | shares   665,994        
Fair value of debt component   $ 215,800        
Debt instrument, fair value of embedded option   $ 71,700        
Principal balance     $ 287,500   $ 287,500  
Effective interest rate percentage   5.26%        
Conversion price (in dollars per share) | $ / shares     $ 52.35      
Conversion ratio per $1 principal amount     0.0191022      
Number of shares to be received upon conversion of debt | item     5,500,000      
Threshold percentage of share price that triggers conversion     135.00%      
Debt conversion, threshold trading days | item     20      
Debt conversion, threshold consecutive trading days | item     30      
Debt Instrument, Convertible, Consecutive Trading Days Available for Conversion     10 days      
Debt Instrument, Convertible, Threshold Consecutive Trading Days     5 days      
Debt Instrument, Convertible, Threshold Percentage of Conversion     98.00%      
Percentage of the total voting power of all classes of common equity as defined as a fundamental change per the terms of the debt agreement     50.00%      
Change in control conversion price, as percentage of par plus interest     100.00%      
Minimum | Credit Agreement            
Long-Term Debt            
Total net leverage ratio, debt covenant     1.50      
Minimum | Revolving Credit Facility | Alternative Base Rate Loans And Canadian Prime Rate Loans [Member]            
Long-Term Debt            
Margin (as a percent) 0.00%          
Minimum | Revolving Credit Facility | Adjusted LIBOR Loans, Canadian Dealer Offered Rate Loans And Bank Bill Swap Reference Rate Loans [Member]            
Long-Term Debt            
Margin (as a percent) 1.00%          
Minimum | Revolving Credit Facility | Johannesburg Interbank Agreed Rate Loans [Member]            
Long-Term Debt            
Margin (as a percent) 1.25%          
Maximum | Credit Agreement            
Long-Term Debt            
Senior secured net leverage ratio, debt covenant     2.25      
Total net leverage ratio, debt covenant     4.00      
Total net leverage ratio related to restricted payments     3.00      
Maximum | Revolving Credit Facility | Alternative Base Rate Loans And Canadian Prime Rate Loans [Member]            
Long-Term Debt            
Margin (as a percent) 1.25%          
Maximum | Revolving Credit Facility | Adjusted LIBOR Loans, Canadian Dealer Offered Rate Loans And Bank Bill Swap Reference Rate Loans [Member]            
Long-Term Debt            
Margin (as a percent) 2.25%          
Maximum | Revolving Credit Facility | Johannesburg Interbank Agreed Rate Loans [Member]            
Long-Term Debt            
Margin (as a percent) 2.50%